| 摘要 |
PURPOSE:To realize an input of an accurate position, by supplying the coordinate through a display after magnifying and displaying a desired position. CONSTITUTION:The indication of a light pen 9 is sent to a control circuit 2 and a vector plane controlling circuit 3. The circuit 2 calculates the start address on a picture memory 1 corresponding to the display indicated position as well as the size of a magnified diagram after calculating the address on the memory 1, transmits a process code to a magnifying/reducing circuit 5, and reads the data from the memory 1. On the other hand, the circuit 3 calculates the address on a display 10 and writes the cursor into a vector plane memory 7. The magnified diagram thus obtained is stored in a dot plane memory 6 and also displayed on the display 10. |
